碳含量对铁基粉末冶金摩擦材料力学性能的影响

随石墨含量增加,铁基粉末冶金含油减磨材料机械性能的变化趋势是密度增加,含油率下降,布氏硬度增加,而压溃强度减小。研究结果表明,石墨含量为1.5wt%和2.0wt%时力学性能较好。     

扩招后地方区域性高校教学管理改革探讨

大扩招给地方区域性高校带来了发展机遇,也给学校的教学和管理带来了许多问题,本文就地方区域性高校扩招后所面临的教学管理问题进行探讨,力求提出一些解决问题的办法.     

Phase Transformations of Graphite and Carbon Black by Laser with Low Power Density

The structure phase transformations of graphite and carbon black induced by pulsed laser were studied in this paper.Under irradiation with laser beam of 1.06 μm wavelength and power density of 106 W·cm-2,both graphite structure and carbon black structure were changed obviously.The results of Raman analyses and Transmission Electron Microscopy(TEM)observations show that graphite transforms into nanodiamond about 5 nm and carbon black is graphitized.It is demonstrated that graphite is the intermediate phase in the transformation from carbon black to diamond,and graphite is easier to transform into diamond by laser irradiation than carbon black.     

Experimental and FEM Study of Coated and Uncoated Tools Used for Dry Milling of Compacted Graphite Cast Iron

Compacted graphite cast iron (CGI) has been the material for high-power diesel engines recently, but its increased strength causes poor machinability. In this study, coated and uncoated carbide tools were used in dry milling experiment and FEM simulation to study the machinability of CGI and wear behaviour of tools. The experimental and FEM simulation results show that coated tool has great advantage in dry milling of CGI. SEM and EDS analysis of tool wear indicate the wear morphology and wear mechanism. Adhesive wear is the main mechanism to cause un-coated tool wear, while abrasive wear and delamination wear are the main mechanism to cause coated tool wear. Stress and temperature distribution in FEM simulation help to understand the wear mechanism including the reason for coating peeled off.     

试论扩招背景下高校图书馆读者服务工作的潜能开拓

在高校大规模扩大招生数量的背景之下，在图书馆图书数量、建筑面积一时难以达到要求的具体情况下，提高读者服务质量、充分挖掘高校图书馆读者服务工作潜能需要在以下几方面用力：为考级考研学生开设专架和专室、办好相关专栏；针对学校重点学科建设开设专架或专室，实行专人管理和学科馆员的个性化服务；提高服务人员的专业素质和业务能力。     

膨胀石墨对二氧化碳的吸附研究

采用常压吸附法研究了膨胀石墨吸附剂在二氧化碳/氮气体系中对二氧化碳的动态吸附性能,比较了其吸附量、穿透曲线和吸附性能的差异.研究了膨胀石墨的比表面积,孔径分布等因素对其二氧化碳吸附性能的影响.结果表明:膨胀体积越大的膨胀石墨,其对二氧化碳的吸附能力越强,最高可达190 mg/g以上.其吸附量随温度升高而呈现下降趋势,但在30℃时吸附量仍达到90 mg/g以上.     

Carbon of Magical Structures

<正>As one of the Partner Groups which were initiated to promote scientifi c exchanges and collaborations between the Max Planck Society(MPS)and the Chinese Academy of Sciences(CAS),the Partner Group led by Prof.Dr.ZHI Linjie was established on May,2010.During the past three years,the group received substantial support from the CAS and the Max-Planck-Institute for Polymer Research(MPIP)for extensive exchanges and collaborations on carbon-rich nanomaterials.Productive collaborations between the researchers and the students from the National Center for Nanoscience and Technology(NCNST)and the MPIP as well as the collaborations between the Partner     

人造碱基与人工合成生命

文章就人造碱基及相关人工合成生命领域内的代表性研究成果进行了全景式综述,着重介绍了氢键互补及疏水性两种最为主要的人造碱基对,探讨了具有里程碑意义的六核酸分子人工合成生命及其对合成生物学未来发展的影响,简单综述了人造碱基在DNA检测诊断试剂盒等方面的成功应用实例。最后对这一研究领域的前景和面临的挑战进行了展望。     

扩展版科学引文索引(SCIE)的编排和利用

扩展版科学引文索引是美国费城科学信息研究所出版的一种多学科检索工具，合有大量科学信息。本文详细介绍搜索这些信息的各种索引，选项，限定，链接和方式，对此检索工具的用途，从研究工作者的角度。结合实例做了介绍。对它的局限性和使用注意事项也做了说明。     

成人高教招生规模扩大后质量保证研究

自20世纪90年代末以来，成人教育迅猛发展，然而其质量也日益引起国人关注。通过增加投入，加强师资队伍．管理队伍建设，调整培养目标，严肃考风考纪以提高成人教育质量。